The phrase "to build a happy family" means to create an environment and relationships within a family that promote happiness, harmony and well-being. This can involve fostering open communication, mutual respect and support among family members. It may also involve setting goals and working towards them as a family, spending time together and engaging in activities that promote bonding, as well as creating a safe and nurturing environment for everyone. The goal of "building a happy family" is to create an atmosphere where everyone feels valued, supported and happy.